Model of Transforming Trajectory Coordinates of Trajectory Correction Projectile Measured by Ship Borne Tracking Radar

弹道修正弹是目前信息化弹药的研究热点之一,为了对舰炮发射修正弹后的实际弹道与预定弹道进行比较、形成修正指令,建立了舰载雷达所测量的相对弹道到相对地球静止的绝对坐标系的转换模型,解决了舰炮发射修正弹以后舰艇继续航行,雷达随舰艇运动、摇摆和升沉对测量弹道的影响.仿真结果证明,该模型是可行的,可为进一步研究弹道辨识问题提供依据.     

Co‐optimization of SnS absorber and Zn(O,S) buffer materials for improved solar cells

Thin‐film solar cells consisting of earth‐abundant and non‐toxic materials were made from pulsed chemical vapor deposition (pulsed‐CVD) of SnS as the p‐type absorber layer and atomic layer deposition (ALD) of Zn(O,S) as the n‐type buffer layer. The effects of deposition temperature and annealing conditions of the SnS absorber layer were studied for solar cells with a structure of Mo/SnS/Zn(O,S)/ZnO/ITO. Solar cells were further optimized by varying the stoichiometry of Zn(O,S) and the annealing conditions of SnS. Post‐deposition annealing in pure hydrogen sulfide improved crystallinity and increased the carrier mobility by one order of magnitude, and a power conversion efficiency up to 2.9% was achieved. Copyright © 2014 John Wiley & Sons, Ltd.     

国内32位MCU产业发展趋势及技术壁垒分析

MCU是一种广泛使用的集成电路器件,它集成了CPU、片上存储器、输入输出接口、以及信号采集、控制等电路.随着应用设计需要的资源越来越多,32位MCU将逐步取代8/16位MCU,占据主要市场.本文详细论述了国内32位MCU产业的发展现状和发展趋势,同时,针对国内本产业的发展现状,指出该产业的技术壁垒,并提出相应的攻克路径,以推动国内32位MCU产业的发展.     

传输技术在人防通信工程维护中的应用

人防通信工程是国防工程的重要组成部分,对人们的生活和国民经济发展都有着非常重要的影响。为了保证人防通信工程的使用性能,发挥出人防通信工程的积极作用,文章对人防通信工程中的传输技术及其维护进行了研究。首先,对人防通信工程传输技术进行了研究,指出光纤通信技术、无线通信技术两种通信技术。其次,对人防通信工程传输技术维护中存在的问题进行研究,提出了其中存在的人才缺乏、维护不到位、施工不规范、材料及设备质量不合格等问题。最后,对人防通信工程中传输技术维护措施进行了研究,重点提出了加大人才培养、规范施工等5项措施。     

发射与接收成像的Strehl比差异性研究

利用谱反演法来模拟畸变相位屏,通过设定激光发射系统的特征参量,计算得出发射光的远场光斑与接收光的远场光斑的峰值Strehl比,并根据Pearson相关性的定义,计算得出峰值Strehl比、相关系数大小随传输效应的特征参量（湍流效应特征参量D/r₀、热晕热畸变参量Nd）变化趋势.分析发射光与接收光的Strehl比的相对偏差,验证相关系数的合理性。通过分析其相对偏差和相关系数来研究发射光与接收光远场光斑Strehl比的差异性.     

机载数字音频系统架构及关键要素符合性研究

机载音频系统的通话质量直接关系到飞机的飞行安全,话音信号的清晰度及通话时延会影响到飞行员对话音信号的接收及心理感受。根据机载音频系统最小性能标准要求,给出基于AFDX的机载数字音频系统的整体架构方案,并对该架构下的系统信息处理技术的选择及传输时延进行分析计算,分析表明,该架构设计可以满足机载通信系统的性能要求。提供了相应架构下的数字音频系统关键指标的适航符合性测试方案,为机载数字音频系统的设计研发提供依据。     

A CW, 94 GHz Second Harmonic Gyrotron with a Continuous Operation Solenoid Cooled by Water

Journal of Infrared, Millimeter, and Terahertz Waves - Design and experimental results of a continuous wave (CW), 94 GHz second harmonic gyrotron with a 1.8 T continuous operation solenoid are...     

A sub-sampling 4.25 GS/s 3-bit flash ADC with asymmetric spatial filter response

A sub-sampling 3-bit 4.25 GS/s flash ADC with a novel averaging termination technique—asymmetric spatial filter response—in 0.13 um CMOS for impulse radio ultra-wideband (IR-UWB) receiver is presented. In this design, a track and hold (T/H) circuit with self-biased buffer is used to compensate the degradation in amplitude when frequency increases to giga Hz. Averaging termination technique using asymmetric spatial filter response is proposed to relieve the termination offset of the flash ADC. A revised encoder scheme is adopted to solve the problem of different propagation delay. The measurement results reveal that the SFDR and SNDR of the ADC are 26.3 dB and 18.4 dB, respectively, even the input signal frequency is 4.2 GHz. INL and DNL are measured improved to 0.11LSB and 0.18LSB, respectively, when asymmetric spatial filter is used. The power of ADC is 63 mW and the active area is 0.49×0.72 mm². The ADC achieves a figure of merit (FoM) of 2.2 pJ/conversion-step.     

Reflow discoloration formation on pure tin (Sn) surface finish

Pure tin finish is popularly used as the end finish for semiconductor leadframes and electrical connectors. However, the problem of reflow discoloration formation on pure tin surface finish degrades the packaging reliability of the integrated circuits (ICs), which greatly limits the application of pure tin plating. This paper reported on the aspect of the reflow discoloration formation on pure tin finish, and the effects of impurities of the substrate and the electroplating conditions on the tin finish discoloration after reflow were discussed. A significant improvement in the tin finish reflow discoloration is obtained by taking suitable electroplating process.     

波束组合器微波传输特性的实验研究*

波束组合器是复合制导半实物仿真系统中的关键设备,为了分析半实物仿真系统中微波传输过程和有效地研究波束组合器对微波场的影响,利用四端口网络法对该波束组合器的结构进行了设计。针对波束组合器对微波传输特性的影响进行了实验研究,主要包括微波传输振幅的衰减和微波传输方向的变化情况。同时建立了该系统的理论模型,最后采用物理光学法对框架绕射引起的相对相位变化进行了仿真验证,仿真结果和实测结果相符合,即不同微波频率造成的波束组合器的振幅衰减和微波传播方向不同,发射天线的偏移会引起振幅和相对相位差变化。